Results: SAN activity in pediatric patients was solely observed near the junction of the superior caval vein and the right atrium, while in adults SAN activity was observed even up to the middle part of the right atrium. Conduction velocity (CV) and the amount of conduction block (CB) was calculated. Unipolar voltage, relative R-to-S-amplitude ratio and duration of all potentials was calculated. Unipolar potentials were classified as single-, short or long double- and fractionated potentials. Methods: Epicardial mapping of the SAN was performed during sinus rhythm in 12 pediatric (0.6 years) and 15 adult (47 years) patients. We examined differences in electrophysiological properties of the sino-atrial node (SAN) area between pediatric and adult patients with CHD. 2Department of Cardiothoracic Surgery, Erasmus Medical Centre, Rotterdam, Netherlandsīackground: Sinus node dysfunction (SND) and atrial tachyarrhythmias frequently co-exist in the aging patient with congenital heart disease (CHD), even after surgical correction early in life.1Department of Cardiology, Erasmus Medical Centre, Rotterdam, Netherlands.
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